Recent scientific research tells us that earthworms could be a threat to Canada’s boreal forest and its essential role in the fight against climate change. …“Most earthworms disappeared from North America during the last ice age more than ten thousand years ago,” explains Dr. Jérôme Laganière, a research scientist at the Laurentian Forestry Centre of Natural Resources Canada. “They reappeared in the 18th century with the settlement of European colonists, probably transported with the soil from tomato plants.” …Earthworms are voracious, attacking the organic part of the soil called humus, which is composed of moss, leaves, tree debris and other organic material. Humus can easily reach a thickness of 10 to 15 centimetres in the boreal forest. As a result, by consuming this material, earthworms are actually destroying a carbon reservoir and releasing carbon dioxide (CO2) into the atmosphere, which contributes to climate change.